Arch Linux 2020 luks cryptsetup systemd-boot installation
the video the following video shows the whole installation below the video you’ll find the transcript
*{padding:0;margin:0;overflow:hidden}html,body{height:100%}img,span{position:absolute;width:100%;top:0;bottom:0;margin:auto}span{height:1.5em;text-align:center;font:48px/1.5 sans-serif;color:white;text-shadow:0 0 0.5em black}▶" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen title="test title" getting the iso you can grab the latest archlinux iso from https://www.archlinux.org/download/ download the iso and the matching signature to verify, if you are doing this from a arch you can use:
pacman-key -v archlinux-2020.05.01-x86_64.iso.sig ==> Checking archlinux-2020.05.01-x86_64.iso.sig... (detached) gpg: Signatur vom Fr 01 Mai 2020 07:33:57 CEST gpg: mittels RSA-Schlüssel 4AA4767BBC9C4B1D18AE28B77F2D434B9741E8AC gpg: Hinweis: Die "trustdb" ist nicht schreibbar gpg: Korrekte Signatur von "Pierre Schmitz <pierre@archlinux.